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I ve got n55 135i with jb3 piggy back system. Runs like a champ never had experience with flash tunes, but people that have done it are happy as well. ( even tho the gains are smaller and $ is way more) .
Intake wise I will be getting an aFe intake for n55 from modbargains.com
It's a bit pricey but after reading all the reviews on it I think it's well worth it. ( btw it's listed for 335, but confirmed to fit 135)

Hope that helps
And yeah... I wish there would be mere action in 1 series forum

That's the intake I'm looking to get, stockish looking and good reviews.
Tail pipe, can't really tell you anything about that. I haven't looked into that. I'm pretty happy with the stock one, I did a "t" mod on it and loving it. The only thing I would consider is getting a downpipe, but pricey ....$700
And lights..... Just let em be man, they r good looking as it is

Tune options so far: jb3 and procede
Gains are similar, but from what I've learned about em, jb3 is more like install and forget about it, procede is more for people that need a toy to play around with( I.e. Shift light, internal boost gauge etc). Price wise, jb3 is way cheaper, that's why I personally went for it and loving it
On both tunes you get about 50hp and 60tq to the wheels.

I think I will do waht you did and get a Jb3.
The stage 1 from Dinan may not be available before another 4 months.
And is cost alot of $$$ for the gain.

Question for you.
Is the Jb3 kit easy to install.
Did you buy directly from Burger Motorsport.
I assume they provide some picture as where each connecters are install.
Did you get that option "CAN tool" with it.

Yes, I got it directly from Burger Motorsport, but if you're in GTA we have a dealler that sell them out of Mississauga if you e-mail him you can schedule a local pick up there's the we site www.n54tuning.com. If you buy through the web site delivery in GTA is next day.
My advice to you is to get a can tool and a USB cable all at once to save the hassle. I found Can Tool rather useless aside from deleting codes which you will have running a tune, I don't mean CEL codes, but tuner detection, burnout etc. CT will come handy when taking to stealership for repairs or maintenance.
USB cable is a musg tho... After having fun on stock JB3 settings for about a week you"ll want more and I can promise you that Just any USB cable will not do it has to be a specific one from Burger Motorsport otherwise will not work. With it you can tweak boost settings a bit which will help you get rid of your tires quick
About the installation: pretty easy to install took me about 35-40 min first time I did it,bacause really not to clear in the instructions about the location of the last sensor, but if you use it their installation manual and look close on all the pictures you'll be ok.
Another word of advise, install your usb cable right away if you get it to save the hassle of taking the car apart again